Effect of La–CO substitution on the crystal structure and magnetic properties of low temperature sintered Sr1−La Fe12−Co O19 (x=0–0.5) ferrites

Peng, Long; Li, Lezhong; Wang, Rui; Hu, Yun; Tu, Xiaoqiang

doi:10.1016/j.jmmm.2015.06.005

Cited by 43 publications

(13 citation statements)

References 17 publications

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“…In recent years, several studies tried to greatly improve the properties of M-type Sr–HFs via the cosubstitution of Ce–Y [16], Nd–Zn [17], La–Co [18], La–Cu [19], Zr–Mn [20], Nd–Co [21], La–Zn [22], Nd–Zn [23], Gd–Sn [24], Pr–Ni [25], Bi–Cr [26], Co–Zr [27], Co–W [28], and Mn–Zn [29]. However, the role of both Mn and Y cosubstitution on the various properties of M-type Sr–HFs has not yet been studied.…”

Section: Introductionmentioning

confidence: 99%

Manganese/Yttrium Codoped Strontium Nanohexaferrites: Evaluation of Magnetic Susceptibility and Mossbauer Spectra

et al. 2018

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Manganese (Mn)- and yttrium (Y)-substituted Sr-nanohexaferrites (MYSNHFs) of composition Sr1−xMnxFe12−xYxO19 (with 0.0 ≤ x ≤ 0.5) were prepared by citrate sol-gel autocombustion method. As-prepared MYSNHFs were characterized via diverse analytical techniques to determine the influence of Mn and Y cosubstitution on their microstructures and magnetic properties. 57Fe Mössbauer spectra of the MYSNHFs were used to evaluate the variation in the line width, isomer shift, quadrupole splitting, and hyperfine magnetic field values. It was shown that the dopant ions could preferentially occupy the 12k, 4f2, and 2b sites. Furthermore, the observed shift in the blocking temperatures of the studied MYSNHFs towards lower values with rising Mn2+ and Y3+ contents was attributed to the overall particles size reduction. Meanwhile, the AC susceptibility of the proposed MYSNHFs revealed that the magnetic interactions were weakened with the increase in dopant contents which was ascribed to the replacement of both Sr2+ and Fe3+ ions by the Mn2+ and Y3+ dopants.

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Section: Introductionmentioning

confidence: 99%

Manganese/Yttrium Codoped Strontium Nanohexaferrites: Evaluation of Magnetic Susceptibility and Mossbauer Spectra

et al. 2018

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“…Therefore, La +3 cations have the reliable probability to occupy the Sr-site rather than the rest of the cationic sites. In the literature [31][32][33][34][35], it was observed that the incorporation of rare earth cations into the site of divalent element can induce the conversion of Fe +3 ions to Fe +2 ions within the hexaferrite system. Subsequently, in the current study, it is possible to replace the Sr +2 ions (high ionic radii) by La +3 ions (small ionic radii).…”

Section: Resultsmentioning

confidence: 99%

Structural, electrical, and magnetic properties of nano Sr1-XLaXFe12O19 (X = 0.2 - 0.8)

Basha¹,

Kumar²,

Naidu

et al. 2022

Preprint

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The current work mainly focused on the synthesis, structural, electrical, and magnetic characterization of Sr1 − XLaXFe12O19 (X = 0.2–0.8) (SLFO) nanoparticles synthesized via the hydrothermal reaction technique. The hexagonal crystalline planes were determined using X-ray diffraction analysis. The obtained results indicated that the lattice constants were noted to be increasing from 0.58801 to 0.58825 nm (a = b), and 2.30309 to 2.30341 nm (c) with increase of ‘X’. The morphological studies ensured that the grains as well as nanoparticles of SLFO acquired almost spherical shape. The optical properties were investigated using FTIR and UV-Visible spectra. The optical bandgap (Eg) of SLFO was found to be increasing from 1.866–2.118 eV with dopant content. The electrical properties of SLFO were studied in detail as a function of temperature, and frequency. In addition, the dielectric modulus, and impedance spectroscopy analysis was carried out to describe the space charge polarization, and electric conduction mechanism respectively. The hysteresis loop (M-H curves) of SLFO revealed the decrease of magnetization from 36.34–7.17 emu/g with ‘X’.

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“…Among these substituents, La-Co co-substitution has been found to be very effective in improving H a without significantly decreasing M s . However, previous reports on the effect of La-Co co-substitution for SrM on the structural parameters, including the lattice parameters and unit cell volume, as well as the intrinsic magnetic properties of M s and H a , are not in good agreement with each other [17][18][19][20][21][22][23]. The M s value increased gradually with increasing La-Co co-substitution (x) up to x = 0.3 [18], or it increased up to x = 0.2 and then decreased with further increasing x [19], or it decreased continuously [20].…”

Section: Introductionmentioning

confidence: 85%

“…However, previous reports on the effect of La-Co co-substitution for SrM on the structural parameters, including the lattice parameters and unit cell volume, as well as the intrinsic magnetic properties of M s and H a , are not in good agreement with each other [17][18][19][20][21][22][23]. The M s value increased gradually with increasing La-Co co-substitution (x) up to x = 0.3 [18], or it increased up to x = 0.2 and then decreased with further increasing x [19], or it decreased continuously [20]. The variation in H a with x showed a common tendency; H a increased gradually with increasing x, although there was a significant difference in the H ci values [17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 85%

“…The M s value increased gradually with increasing La-Co co-substitution (x) up to x = 0.3 [18], or it increased up to x = 0.2 and then decreased with further increasing x [19], or it decreased continuously [20]. The variation in H a with x showed a common tendency; H a increased gradually with increasing x, although there was a significant difference in the H ci values [17][18][19][20][21][22][23]. This difference in the intrinsic magnetic properties of La-Co co-substituted SrM is likely due to the sintering additives such as SiO 2 [18,21,24], CaCO 3 [18,21], and Bi 2 O 3 [19].…”

Section: Introductionmentioning

confidence: 99%

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Effects of La-Co Co-Substitution on the Structural and Magnetic Properties of SrM Hexaferrites Prepared by Solid-State Reaction

Lee,

Kang,

Yoo

2024

Applied Sciences

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The effects of La-Co co-substitution on the structural and magnetic properties of strontium M-type hexaferrites (SrM) were carefully investigated for the Sr1−xLaxFe12−xCoxO19 (0.0 ≤ x ≤ 0.3) polycrystalline samples prepared by solid-state reaction in air. Without the use of sintering additives, La-Co co-substituted SrM single phases could be obtained from polycrystalline bulk samples by employing proper processing conditions. The lattice parameter a initially increases with increasing x from 0.0 to 0.1 but gradually decreases with increasing x to 0.20, and then remains almost unaltered up to x = 0.3; the lattice parameter c monotonously decreases with increasing x from 0.0 to 0.25, but it turns to an increase when x = 0.3. The reduction in c/a ratios and Vcell values with increasing x up to x = 0.25 are obviously attributable to the decreasing size effect resulting from La3+ substitution at the Sr2+ site, which surpasses the increasing size effect due to Co2+ and Fe2+ occupancy at the Fe3+ site. Meanwhile, with increasing x from 0.0 to 0.3, while the saturation magnetization (MS) continuously decreases from 75.90 to 72.07 emu/g, the magnetic anisotropy field (Ha) increases from 20.1 to 24.7 kOe, leading to an increase in the intrinsic coercivity (Hci) from 2.68 to 3.99 kOe. The gradual increase in Ha with x, probably caused by a gradual decrease in the crystallographic symmetry, is inversely proportional to the variation in the c/a ratios up to x = 0.25 as usual except when x = 0.3, of which deviation needs further study.

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Effect of La–CO substitution on the crystal structure and magnetic properties of low temperature sintered Sr1−La Fe12−Co O19 (x=0–0.5) ferrites

Cited by 43 publications

References 17 publications

Manganese/Yttrium Codoped Strontium Nanohexaferrites: Evaluation of Magnetic Susceptibility and Mossbauer Spectra

Manganese/Yttrium Codoped Strontium Nanohexaferrites: Evaluation of Magnetic Susceptibility and Mossbauer Spectra

Structural, electrical, and magnetic properties of nano Sr1-XLaXFe12O19 (X = 0.2 - 0.8)

Effects of La-Co Co-Substitution on the Structural and Magnetic Properties of SrM Hexaferrites Prepared by Solid-State Reaction

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